How your movements create a GPS 'fingerprint'
In a wrap-up of last year's developments in mobile privacy, the group's Hanni Fakhoury and Marcia Hofmann noted that, in multiple cases, law enforcement has approached wireless carriers for mobile data to track users. At least one court has ruled that users have no reasonable expectation of privacy regarding their cell phone data.
"(T)he government claims that cell phone users give up their privacy rights because they have voluntarily disclosed their physical location to the cell phone providers every time a phone connects to the provider's cell tower," EFF said in a statement related to an October court case. "... However, this theory undermines privacy in nearly any networked communication."